First Law of Thermodynamics

The first law of thermodynamics states that the energy of the universe remains constant. Energy may exchanged between the system and its surroundings, but it can neither be created nor destroyed. This means that the total amount of energy in the universe remains constant. For closed systems, the first law was originally induced from empirically observed evidence. Adiabatic Processes There is transfer of energy as work but not as heat in an adiabatic process. Irrespective of how the work is done, for all adiabatic process that takes a system from a given initial state to a given final state the respective eventual total quantities of energy transferred as work are the same.  The work done on the system is defined and measured by changes in mechanical or quasi-mechanical variables external to the system.  Physically, adiabatic transfer of energy as work requires the existence of adiabatic enclosures. Adiabatic work takes the system either from a reference state O with internal e...